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United States Patent |
5,557,985
|
Nagano
|
September 24, 1996
|
Bicycle cleat coupling structure
Abstract
An apparatus for coupling a cleat has a pedal shaft for rotatably
supporting a pedal, a tread surface extending parallel to the pedal shaft
for contacting a bottom of a shoe, a first pivotal axis provided on the
pedal, and a first cleat clamp pivotable about the first pivotal axis. The
first cleat clamp includes a recess for engaging one end of the cleat
until a force exceeding a predetermined value is applied thereto. Further,
this apparatus has a second cleat clamp opposed to the first cleat clamp
across the pedal shaft, and a pair of restrictor projections disposed
between the second cleat clamp and the pedal shaft for restricting
displacement to the cleat. The second cleat clamp cooperates with the
first cleat clamp to couple the cleat to the pedal. The restrictor
projections are spaced apart from each other by a distance greater than a
width along the pedal shaft of a portion of the cleat for contacting the
restrictor projections. Thus, the cleat is allowed to oscillate freely on
the tread surface through the distance between the resistors projections
and about the recess.
Inventors:
|
Nagano; Masashi (Izumi, JP)
|
Assignee:
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Shimano Inc. (Osaka, JP)
|
Appl. No.:
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376308 |
Filed:
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January 23, 1995 |
Foreign Application Priority Data
Current U.S. Class: |
74/594.6; 74/594.4 |
Intern'l Class: |
G05G 001/14 |
Field of Search: |
74/594.4,594.6
36/131,132
|
References Cited
U.S. Patent Documents
4570310 | Feb., 1986 | Gelula | 74/594.
|
5048369 | Sep., 1991 | Chen | 74/594.
|
5142938 | Sep., 1992 | Sampson | 74/594.
|
5203229 | Apr., 1993 | Chen | 74/594.
|
5259270 | Nov., 1993 | Lin | 74/594.
|
5279184 | Jan., 1994 | Ogino | 74/594.
|
Foreign Patent Documents |
0372165 | Jun., 1990 | EP | 74/594.
|
0428140 | May., 1991 | EP | 36/131.
|
0516013 | Dec., 1992 | EP | 74/594.
|
2-128987 | May., 1990 | JP | 74/594.
|
3-159893 | Jul., 1991 | JP | 74/594.
|
4-183694 | Jun., 1992 | JP | 74/594.
|
Primary Examiner: Luong; Vinh T.
Attorney, Agent or Firm: Dickstein, Shapiro & Morin, L.L.P.
Parent Case Text
This application is a continuation of application Ser. No. 07/973,883,
filed Nov. 10, 1992, now abandoned.
Claims
What is claimed is:
1. An apparatus for coupling a shoe having a cleat to a bicycle pedal with
a pedal shaft for rotatably supporting said pedal, comprising:
a shoe bottom opposing surface that faces a bottom of said shoe;
a first pivotal axis provided on said pedal;
a first cleat clamp supported by said first pivotal axis, and including
cleat engaging means for engaging one end of said cleat until a force
exceeding a predetermined value is applied thereto;
a second cleat clamp opposed to said first cleat clamp across said pedal
shaft, said second cleat clamp being cooperative with said first cleat
clamp to hold said cleat to said pedal; and
a pair of resistor projections disposed between said second cleat clamp and
said pedal shaft, a position of each restrictor projection being such that
said cleat can contact said each restrictor projection when said cleat is
engaged by said first and second cleat clamps, said pair of restrictor
projections being provided for restricting displacement of said cleat by
contact therewith;
wherein said restrictor projections project with respect to said shoe
bottom opposing surface and are spaced apart in a direction substantially
parallel to said first pivotal axis by a distance greater than a width
along a pedal shaft of a portion of said cleat for contacting said
restrictor projections, thereby allowing said cleat to oscillate freely on
said shoe bottom opposing surface through said distance between said
restrictor projections and about said cleat engaging means.
2. An apparatus as defined in claim 1, wherein said pedal further includes
a second pivotal axis opposed to said first pivotal axis across said pedal
shaft, said second cleat clamp being supported by said second pivotal
axis.
3. An apparatus as defined in claim 1, wherein said restrictor projections
extend substantially perpendicular to said shoe bottom opposing surface.
4. An apparatus as defined in claim 1, wherein said first and second
pivotal axes extend parallel to said pedal shaft.
5. An apparatus as defined in claim 1, wherein said cleat engaging means
includes a recess defined in said first cleat clamp for engaging said
cleat.
6. An apparatus as defined in claim 5, wherein said first cleat clamp
includes a first clamping projection extending substantially parallel to
said shoe bottom opposing surface toward said second cleat clamp and
defining said recess, and wherein said second cleat clamp includes a
second clamping projection extending substantially parallel to said shoe
bottom opposing surface toward said first cleat clamp, said first clamping
projection and said second clamping projection being restricted against
movement away from said shoe bottom opposing surface, thereby to hold said
cleat to said pedal.
7. An apparatus as defined in claim 1, wherein said restrictor projections
are aligned symmetric about a centerline extending perpendicular to said
pedal shaft and included in said shoe bottom opposing surface, said
restrictor projections diverging away from said centerline as said
restrictor projections extend toward said second cleat clamp.
8. An apparatus as defined in claim 1, wherein said restrictor projections
are arranged to restrict free movement of said cleat along a centerline
extending perpendicular to said pedal shaft and included in said shoe
bottom opposing surface.
9. An apparatus for coupling a shoe having a cleat to a bicycle pedal, said
bicycle pedal being rotatably supported by a pedal shaft, the apparatus
comprising:
a shoe bottom opposing surface extending parallel to said pedal shaft for
contacting a bottom of said shoe;
a first pivotal axis provided on said pedal;
a first cleat clamp supported by said first pivotal axis, and including
cleat engaging means for engaging one end of said cleat until a force
exceeding a predetermined value is applied thereto;
a second cleat clamp opposed to said first cleat clamp across said pedal
shaft, said second cleat clamp being cooperative with said first cleat
clamp to hold said cleat to said pedal; and
a pair of restrictor projections disposed between said second cleat clamp
and said pedal shaft for restricting displacement of said cleat;
wherein said restrictor projections project with respect to said shoe
bottom opposing surface and are spaced apart in a direction substantially
parallel to said first pivotal axis by a distance greater than a width
along said pedal shaft of a portion of said cleat for contacting said
restrictor projections, thereby allowing said cleat to oscillate freely on
said tread surface through said distance between said restrictor
projections and about said cleat engaging means, and
wherein said restrictor projections are aligned symmetric about a
centerline extending perpendicular to said pedal shaft and included in
said shoe bottom opposing surface, said restrictor projections diverging
away from said centerline as said restrictor projections extend away from
said second cleat clamp.
Description
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a structure for coupling a cleat to a
bicycle pedal.
2. Description of the Prior Art
Various structures have heretofore been used for coupling cleats to bicycle
pedals. Many of these structures are designed to fix shoes to pedals. The
shoes tend to move axially of the pedals with leg action during cycling.
However, such coupling structures do not allow the shoes to move axially
of the pedals, resulting in an additional burden imposed on the rider's
legs.
FIG. 4 shows a device developed in view of the above drawback. This drawing
shows clamping projections 3 and 4 formed on a pair of cleat damp of a
pedal for securing a cleat to the pedal. References 5a and 5b denote
engaging projections of the cleat 5 shown in FIG. 1. A pedal axis is
referenced X in FIG. 4. This device allows the cleat 5 to oscillate freely
about a pint of contact Z between the projection 5a of the cleat 5 and the
clamping projection 3. Thus, the rear projection 5b of the cleat 5 is
displaceable relative to the clamping projection 4.
With this prior structure, a treading force of the rider's foot is applied
to the pedal at a point F in FIG. 4. This point F is a relatively long
distance away from the point Z about which the cleat 5 is oscillatable.
This results in an inconvenience that, when the cleat 5 oscillate to a
large extent, the cleat 5 would readily slip off the pedal by momentum.
SUMMARY OF THE INVENTION
An object of the present invention is to provide a structure for coupling a
cleat of a rider's shoe to a bicycle pedal, which coupling structure
allows the cleat to oscillate horizontally relative to the pedal about a
temperature position of the cleat
The above object is fulfilled, according to the present invention, by an
apparatus for coupling a cleat comprising a pedal shaft for rotatably
supporting a pedal, a tread surface extending parallel to the pedal shaft
for contacting a bottom of a shoe, a first pivotal axis provided on the
pedal and a first cleat pivotable about the first pivotal axis. The first
cleat clamp includes a cleat engaging device for engaging one end of the
cleat until a force exceeding a predetermined value is applied thereto.
This apparatus further comprises a second cleat clamp opposed to the first
cleat clamp across the pedal shaft, and a pair of restrictor projections
disposed between the second cleat clamp and the pedal shaft for
restricting displacement of the cleat. The second cleat clamp cooperates
with the first cleat clamp to couple the cleat to the pedal.
The restrict projections are spaced apart from each other by a distance
greater than a width along the pedal shaft of a portion of the cleat for
contacting the restrictor projections. Thus, the cleat is allowed to
oscillate freely on the tread surface through the distance between the
restrictor projections and about the cleat engaging device.
As noted above, one end of the cleat is engageable with the cleat engaging
device provided for the first cleat clamp for securing the cleat to the
pedal This cleat engaging device and the pair of restrictor projections
allow the cleat to oscillate freely about the cleat engaging device.
According to the invention, the rider's leg is allowed to move along the
pedal shaft to lighten the burden falling on the leg. Further, a point at
which a treading force is transmitted from the rider's foot to the pedal
is at a reduced distance to the center of the cleat oscillation. This
allows free oscillations of the cleat with little momentum, to minimize
the possibility of the cleat inadvertently becoming disengaged from the
pedal.
Further and other objects, features and effects of the invention will
become more apparent from the following more detailed description of the
embodiment of the invention taken with reference to the accompanying
drawings.
BRIEF DESCRIPTION OF THE DRAWINGS
FIG. 1 a perspective view of a cleat attached to a shoe, and a pedal having
a cleat coupling mechanism according to the present invention,
FIG. 2 is a side view showing engagement between the pedal and cleat shown
in FIG. 1,
FIG. 3 is a plan view of the cleat coupling mechanism according to the
present invention, with unnecessary parts omitted for convenience of
illustration, and
FIG. 4 is a plan view of a known cleat coupling mechanism.
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT
An embodiment of the present invention will be described next with
reference to the drawings.
FIG. 1 shows a bicycle pedal P having a coupling mechanism for coupling a
cleat 5. The pedal P includes a pedal body 1 rotatably supported on a
pedal shaft 2 fixed to a crank arm C. A cycling shoe S is attached to the
pedal P through the cleat 5.
The cleat coupling mechanism will be described next. The pedal P defines a
tread surface 1a for contacting the shoe S. The tread surface 1a is
provided by a contact plate 8 fixed in place by screws. The pedal P
further includes a rear cleat clamp 7 mounted on a support arm 7a to be
pivotable about an axis Y extending parallel to the pedal shaft 2.
The rear cleat clamp 7 includes a cleat clamping projection 4 extending
substantially parallel to the tread surface 1a. The clamping projection 4
has a recess 4a for engaging a rear end projection 5b of the cleat 5.
Though not shown, the rear cleat clamp 7 is biased by a lock spring in a
direction to engage the cleat 5.
Similarity, a front or second cleat camp 6 is supported to the pivotable
about an axis 6a in FIG. 2 extending parallel to the pedal shaft 2, and
biased by a lock spring (not shown) in a direction to engage the cleat 5.
The front cleat clamp 6 also has a cleat clamping projection 3 extending
parallel to the tread surface 1a and toward the mar cleat clamp 7.
The contact plate 8 includes front restrictor projections 8a and 8b and
rear restrictor projections 8c and 8d for restricting movement parallel to
the contact plate 8 of the cleat 5 engaged with the pedal P. As seen from
FIG. 1, the front restrictor projections 8a and 8b extend substantially
perpendicular to the tread surface 1a, and diverge outwardly of the pedal
P toward the rear cleat clamp 7. The rear restrictor projections 8c and 8d
extend outwardly of the pedal P and away from the contact plate 8.
As seen from FIG. 2, the pedal P in this embodiment has a further pair of
front cleat clamp 6 and rear cleat clamp 7 on an opposite surface.
How the cleat 5 is coupled to the cleat coupling mechanism will be
described next. As shown in FIG. 1, the cleat 5 includes a projection 5a
for engaging the front cleat clamp 6, and the projection 5b for engaging
the rear cleat clamp 7. First, the rider inclines the shoe S to place the
tip of the shoe lower than its heel (not shown), and thus the projection
5a lower than the projection 5b. Next, the projection 5a is inserted
between the contact plate 8 and from cleat clamping projection 3. The
front restrictor projections 8a and 8b act as guides at this time. The
rider presses the cleat 5 toward the tread surface 1a with the projection
5a of the cleat 5 inserted between the contact plate 8 and front cleat
clamping projection 3. This causes the rear cleat clamp 7 to pivot about
the axis 76 against the biasing force of the lock spring, whereby the
projection 5b of the cleat 5 is inserted between the contact plate 8 and
rear clamping projection 4.
The front clamping projection 3, under the biasing force of the lock spring
of the from cleat clamp 6, presses the projection 5a of the cleat 5 on the
contact plate 8. Similarly, the rear clamping projection 4, under the
biasing force of the lock spring of the rear cleat clamp 7, presses the
projection 5b of the cleat 5 on the contact plate 8. Thus, the cleat 5 is
attached to the pedal P. In this state, the restrictor projections 8a and
8b restrict free displacement of the cleat 5 in fore and aft directions.
Consequently, the restrictor projections 8a and 8b prevent the cleat 5
from pushing and oscillating the from cleat clamp 6 to become disengaged
from the pedal P.
When releasing the cleat 5 from the pedal P, the rider turns the shoe S
until the projection 5a of the cleat 5 contacts the restrictor projection
8a or 8b. Then, the rider exerts a force exceeding a predetermined value
to twist the shoe 5 about an axis substantially perpendicular to the coma
plate 8 on the pedal P, using a point of contact between the projection 5a
and restrictor projection 8a or 8b as a fulcrum point. This results in the
projection 5b disengaging from the recess 4a. Then, the rear cleat clamp 7
pivots in a release direction against the biasing force of the lock spring
(not shown), thereby releasing the cleat 5 from the pedal P. The rear
restrictor projections 8c and 8d act as guides at this time to facilitate
release of the cleat 5 by raising the cleat 5 from the tread surface 1a
with turning of the cleat 5.
As seen from FIG. 3, the front restrictor projections 8a and 8b are spaced
apart from each other by a width W which is larger than a width H of the
projection 5a of the cleat 5. Thus, the projection 5a is displaceable
sideways relative to the pedal P even when the cleat 5 is attached to the
pedal P. The projection 5b of the cleat 5 has an extreme end 5c thereof
engageable with the recess 4a defined in the rear clamping projection 4.
Strictly speaking, therefore, the displacement of the cleat 5 is its
oscillation about a point of contact Z between the extreme end 5c and the
rear clamping projection 4. Reference M in FIG. 3 denotes a centerline of
the cleat 5. This centerline M has a degree of freedom through an angle
indicated by "A".
When the rider pedals the bicycle, the shoe S is allowed to move along the
pedal shaft as the pedal P moves relative to a bicycle frame. Thus, the
rider's leg is free from an extra burden.
FIG. 4 shows a conventional cleat coupling mechanism which also allows
oscillations of the cleat. However, the oscillations are made about the
point of contact Z between the front clamping projection 3 and the
projection 5a of the cleat 5. The treading force of the rider's foot is
applied to the pedal at the point F in FIG. 4. Since the point F is a
relatively long distance away from the point Z about which the cleat 5 is
oscillatable, the cleat 5 tends to slip off the pedal by momentum when
oscillated to a large extent.
In the construction according to the present invention on the other hand,
the point F has a short distance L to the point Z about which the cleat 5
is oscillatable as shown in FIG. 3. Although the degree of freedom
provided for the cleat 5 is comparable to that of the prior art shown in
FIG. 4, the movement of the cleat 5 involves little momentum, and hence a
reduced chance of becoming disengaged from the pedal. Further, the
oscillations about the point Z result in relatively minor variations in
the distance of the point F to the pedal axis X. This in turn results in
little change in the transmission rate of the treading force from the
rider's foot to the pedal shaft 2.
In the foregoing embodiment, the cleat 5 is oscillatable about the point Z
provided by the recess 4a in the clamping projection 4. This recess may
have a width to allow the projection 5b of the cleat 5 to move freely
relative to the clamping projection 4 along the axis X.
A plurality of club having varied widths H may be provided to make
different degrees of cleat oscillations available. The restrictor
projections 8a and 8b may be positionally adjustable to enable selection
of a degree of cleat oscillations,
The cleat 5 may be adapted oscillatable relative to the shoe rather than
the pedal. Further, the cleat clamps 6 and 7 may be constructed
oscillatable relative to the pedal body, with the cleat 5 and shoe S fixed
to the cleat clamps 6 and 7.
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